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BMW B48 / B38 vs BMW N52 / N53: which engine is more reliable?

According to our risk index, the BMW B48 / B38 carries less risk than the BMW N52 / N53: 24/100 (low risk) versus 48/100 (moderate risk). The BMW B48 / B38 has 1 documented serious fault, the main one being «Timing chain on the early units (2014-2018), redesigned in the B48TU»; the BMW N52 / N53 has 1 documented serious fault, the main one being «N53 piezoelectric injector failure».

Risk index

BMW B48 / B38

24

Low risk · 1 serious fault

Lower risk

Risk index

BMW N52 / N53

48

Moderate risk · 1 serious fault

The index (0–100) weights the severity and frequency of the three most serious documented faults. How it is calculated

14 sourcesHow we work

Is the BMW B48 / B38 reliable?

The BMW B48 (2.0 turbo, from 2014) and its three-cylinder sibling, the B38 (1.5), have a reputation as reliable engines within BMW's modern range: there is no serious, widespread fault on record, unlike the timing chain on the N47 diesel or the EGR fire risk on the B47. Keep an eye on the cooling circuit, the oil seals near the turbo and the VANOS, and the carbon build-up typical of direct injection; BMW revised the timing chain in 2018 (B48TU update).[1][2][3]

See the 4 of the BMW B48 / B38 faults

Is the BMW N52 / N53 reliable?

The BMW N52 (2004-2015, port injection) is considered very reliable for a BMW, with known weak points (electric water pump, oil seals, valve cover). The N53 (2007-2013, direct injection) adds piezoelectric injectors prone to failure, which make it more expensive to maintain.[4][5][6]

See the 6 of the BMW N52 / N53 faults

Side-by-side comparison

Comparison of BMW B48 / B38 and BMW N52 / N53
BMW B48 / B38BMW N52 / N53
Technical data
TypeEngineEngine
FuelPetrolPetrol
Displacement1,998 cm³2,996 cm³
TimingChainChain
Power136–312 hp174–272 hp
Productionsince 2014[1][7][8]2004–2015[6][9][10]
Reliability
Risk index (what is it?)24Low risk48Moderate risk
Documented faults46
Of high or critical severity11
Worst severityHigh severityHigh severity
Main faults
  1. Medium severity: Deterioration of hoses and seals in the cooling circuit, with coolant loss
  2. Medium severity: Oil leaks or seepage from seals and covers, near the turbo and the VANOS
  3. High severity: Timing chain on the early units (2014-2018), redesigned in the B48TU
  1. High severity: N53 piezoelectric injector failure
  2. Medium severity: Electric water pump and thermostat failure
  3. Medium severity: Oil leak from the oil filter housing gasket
Most expensive documented repairNo reliable dataup to €600Electric water pump and thermostat failurePublished figure[11]
Which versions to buy
BuyRecommended versions
  • B38 1.5 136 hp (MINI Cooper, 118i)[2]
  • B48 2.0 178-197 hp (120i, 220i, 320i, 520i, X1/X2/X3 20i, MINI Cooper S)[2]
  • B48 2.0 252-258 hp (330i, 530i, X3/X4 xDrive30i)[2][12]
  • B48 2.0 up to 302-312 hp, high performance (MINI John Cooper Works, BMW X1 M35i)[2]
None
With cautionVersions to be cautious aboutNone
AvoidVersions to avoidNoneNone

Severity of each fault: green, low; amber, medium; red, high; dark red, critical. How we rate them

Cars that each one is fitted to

BMW B48 / B38

See the 20 models with the BMW B48 / B38

BMW N52 / N53

See the 9 models with the BMW N52 / N53

Other comparisons

With the BMW B48 / B38

With the BMW N52 / N53

Compare other engines

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Sources

Every fact on this page links to its source. If you find an error, let us know.

  1. BMW B48Wikipedia (inglés) · Other source · consulted 27 September 2026
  2. Motor BMW B48: defectos, mantenimiento y guía de compraRecambios y Accesorios BMW (blog) · Technical documentation · consulted 27 September 2026 · in Spanish
  3. BMW Reliability Has Changed, But the Internet Hasn't Caught UpBMWBLOG · Other source · published January 2026 · consulted 27 September 2026
  4. These BMW N52 Years Have The Most ProblemsJalopnik · General press · consulted 5 October 2026
  5. BMW N53 Engine ProblemsBMW Tuning · Other source · consulted 5 October 2026
  6. Der BMW N53 Motor: Technische Daten, Probleme, Haltbarkeit & FahrzeuglisteCarWiki · Technical documentation · consulted 5 October 2026 · in German
  7. BMW B38Wikipedia (inglés) · Other source · consulted 27 September 2026
  8. BMW B48Wikipedia (alemán) · Other source · consulted 27 September 2026 · in German
  9. BMW N53Wikipedia · Other source · consulted 5 October 2026
  10. BMW N52Wikipedia · Other source · consulted 5 October 2026
  11. Problemas BMW N52Total Renting · Other source · consulted 5 October 2026 · in Spanish
  12. 5 BMWs That Prove the B48 Four-Cylinder Engine Is Better Than You ThinkBMWBLOG · Other source · published April 2026 · consulted 27 September 2026
  13. BMW N52 Engine ProblemsBMW Tuning · Other source · consulted 5 October 2026
  14. BMW N52 and N53 24 Valve Six Cylinder EnginesUnixnerd · Technical documentation · consulted 5 October 2026